Trio n. (pl. -s) 1 group of three. 2 mus. A composition for three performers. B the performers. [french and italian from latin]Triptych n. Picture or relief carving on three panels, usu. Hinged together at the sides. [after *diptych] fathometer Trivet n. Iron tripod or bracket for a pot or kettle to stand on. [apparently from latin tripes three-footed]Tie-up n. Connection, association.Trolley n. (pl. -s) 1 table, stand, or basket on wheels or castors for serving food, transporting luggage etc., gathering purchases in a supermarket, etc. 2 low truck running on rails. 3 (in full trolley-wheel) wheel attached to a pole etc. Used for collecting current from an overhead electric wire to drive a vehicle. [dial., perhaps from *troll2]Tights n.pl. 1 thin close-fitting wool or nylon etc. Garment covering the legs, feet, and the lower part of the torso, worn by women and girls. 2 similar garment worn by a dancer, acrobat, etc.Tidemark n. 1 mark made by the tide at high water. 2 a line left round a bath by the dirty water. B colloq. Line between washed and unwashed parts of a person's body.Triptych n. Picture or relief carving on three panels, usu. Hinged together at the sides. [after *diptych]Tie-up n. Connection, association.Trolley n. (pl. -s) 1 table, stand, or basket on wheels or castors for serving food, transporting luggage etc., gathering purchases in a supermarket, etc. 2 low truck running on rails. 3 (in full trolley-wheel) wheel attached to a pole etc. Used for collecting current from an overhead electric wire to drive a vehicle. [dial., perhaps from *troll2]